Ch 430 Mhz calibration
mar 2005
There is a 430 Mhz receiver system on the
carriage house line feed. It can be used for transmitting and
receiving. It has native circular polarization. Other 430 systems
include the dome 430
and the 430
yagi (mounted on the carriage house).
Sections:
History
Recent
system
performance measurements
Daily
monitoring
of Tsys
calibration measurements
miscellaneous
cal
values
line feed papers
History:
170720
: hurricane maria. linefeed ends up in dish.
Note sure about the date: strongest digital tv stations no
longer falling in cavity filter notches.
Probably getting intermods with
cavity filter.
PolA: removed cavity filter, put
bandpass filter (that was after lna) before the dewar to cut down
on the intermods.
jan05: last week crr2/lrr2 10 Mhz IF filter replaced with 20
Mhz IF FILTER
27sep05: updated cal values.
30dec04: filters now in front of both pols to get rid of tv
station intermods.
oct04: filter placed in front of dome polA dewar removes
tv
station intermods.
Calibration
measurements:
Miscellaneous:
mar05 GAIN CURVE.
Calibration data taken mar05 was used to compute
a gain curve at 430 Mhz. The gain curve was a function of za only :
g(za)= c0 + c1*za + c2*(za-14)^2 + c3*(za-14)^3 . The last two terms
(za-14) are only used for za gt than 14 degrees. The plots
show
the data and the gain curve fits (.ps) (.pdf)
:
- fig 1: This is the az/za coverage for the gain curves.
- Fig2: The gain, tsys, sefd, and average beam widths for the
data used to make the gain curves. The data was taken in mar05.
Most of this data was used to make a pointing model for the
430ch receiver.
- Fig 3: Top the data and fits. Bottom the fit residuals. The
fit residuals are .57 Jy. The source B1843+098 looks like it's
flux is a bit high at 430Mhz.
This gain curve is now installed in the ao idl
installation. There is also
a description of the gain curves and how to access them.
processing:
x101/430ch/mar05/dogainfit.pro
Line feed Papers
- 1962
love,a.w. spherical reflecting antennas with corrected
line sources. ire trans on ant. and prop. vol ap-10,sept 1962
- 1966,mccormick,g The
theory of a line feed for a spherical reflector. ant. and prop.
soc. international symposium. dec,1966
- 1967,mccormick,g
A line feed for a spherical reflector. ieee tran on ant. and
prop. vol. 15, sep 1967
- 1968 love,a.w.
Line source feed for a spherical reflector. ieee trans on ant,
and prop. jan 1968
- 1969
thomas,minnet,bao Fields in the region of a spherical
reflector. ieee trans on ant. and prop. march 1969
- 1970
lalonde,harris A high-performance line source feed for the
AIO spherical reflector. ieee trans on ant. and prop.. jan 1970
- this is for a 40 foot 318 Mhz flat feed.
- 1970
rumsey, v. On the design and performance of feeds for
correcting spherical aberration. ieee trans. on ant. and
prop.lvol ap-18,no. 3, may 1970
- Arecibo 430Mhz feed development
study. final engineering report
- 1971,love,
a.,w. Arecibo 430Mhz feed developement study. final
engineering report (41Mb) (.pdf)
- 1973 love,a.w.
Scale model development of a high efficiency dual polarized line
feed for the arecibo spherical reflector. ieee trans on ant. and
prop. vol ap-21,no. 5 sep 1973
- 1986 kildal,
per-simon Study of element patterns and excitations of the
line feeds of the spherical reflector antenna in arecibo. ieee
trans on ant. and prop. vol ap-34,no.2 feb 1986 (.pdf)
- 1986 baker,lynn
Optimum Cylindrical near fields for illuminating a spherical
reflector. ieee trans on ant. and Prop. vol ap-34, no. 4,
apr 1986 (.pdf)
- 1988,
kildal p-s. Definition or artificially hard and soft
surfaces for electromagnetic waves. electronics lettes, vol. 24,
no. 3, feb 1988
- 1989,
ulversoy,kildal. Radiation from slots in
artificially soft and hard cylinders. ieee trans on ant. and
prop.,vol.37,no.12, dec 1989.
- 1989,
ulversoy,kildal. Improved element pattern for the line
feeds of the spherical reflector antenna in arecibo. ieee trans
on ant. and prop. vol. 37.no.12,dec 1989
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